All strong mode cleaning of dart2js.

pkg/testing/lib/src/analyze.dart

Index: pkg/testing/lib/src/analyze.dart
diff --git a/pkg/testing/lib/src/analyze.dart b/pkg/testing/lib/src/analyze.dart
index fa2ccd5c6846f80e59f75debde0a974df4131c51..ec67cd4b3d401d7263b14bc2d18eaa50188dfc00 100644
--- a/pkg/testing/lib/src/analyze.dart
+++ b/pkg/testing/lib/src/analyze.dart
@@ -237,14 +237,6 @@ Future<Null> analyzeUris(
     await for (AnalyzerDiagnostic diagnostic in diagnostics) {
       if (diagnostic.uri != null) {
         String path = toFilePath(diagnostic.uri);
-        if (!(analysisOptions?.path?.contains("/pkg/compiler/") ?? false) &&
-            diagnostic.code.startsWith("STRONG_MODE") &&
-            (path.startsWith("pkg/compiler/") ||
-                path.startsWith("tests/compiler/dart2js/"))) {
-          // TODO(ahe): Remove this hack to work around dart2js not being
-          // strong-mode clean.
-          continue;
-        }
         if (!filesToAnalyze.contains(path)) continue;
       }
       String message = "$diagnostic";